Jetta L4-1.9L DSL Turbo (BEW) (2004)
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Disconnect 5-pin connector from Mass Air Flow (MAF) Sensor (arrow).
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Switch ignition on.
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Measure voltage supply for MAF sensor between the following connector terminals:
Connector at Mass Air Flow(MAF) Sensor
Specified value
-G70-Terminal
2 + Ground (GND)
approx. battery voltage
2 + 3
approx. battery voltage
4 + Ground (GND)
about 5 V
4 + 3
about 5 V
If specified values are obtained:
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Replace Mass Air Flow (MAF) Sensor -G70-:
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Erase DTC memory of control module for Diesel-Direct fuel injection system, Diagnostic mode 4: Reset/erase diagnostic data. See: Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode, Selecting/Diagnostic Mode 4: Reset/Erase
Diagnostic Data
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Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If specified values are not obtained:
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Check signal and Ground (GND) wire of Mass Air Flow (MAF) sensor.
Checking signal and Ground wires of Mass Air Flow (MAF) Sensor
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Connect test box to control module wiring harness, connect test box for wiring test. See: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring
Test
Vehicles with 80-pin control module